Originally Posted by jebr

To add to this, Frontier is far worse per 10,000 passengers in terms of involuntarily bumping passengers. From January to September 2022 (page 50, pdf,) their IDB rate was 2.99/10,000, nearly six times higher than the next highest airline. Even Spirit and Allegiant are far better in this respect, despite also being ultra-low-cost carriers.

I won't completely swear off Frontier, but it has to be the only reasonable option these days for me to consider it - even the other ULCCs don't have near as many issues as Frontier seems to.